The above is exactly the importance of Porzingis. I had said in another thread that I see the match up as pairs. For the bigs, it is:
Porzingis/Horford vs Gafford/Lively
If Porzingis can play like regular season Porzingis, and hold up, this big grouping is a big advantage for BOS. If Porzingis is only 75% or whatever and/or no better than Kornet/Tillman, then this may not be an advantage at all.